To see fish swimming in your dream, signifies insights from your unconscious mind. Thus to catch a fish, represents insights which have been brought to the surface.
Alternatively, a fish swimming in your dream may symbolize conception. Some women dream of swimming fish when they get pregnant. The fish is also an ancient symbol of Christianity and Christian beliefs. Consider also the common phrases “like a cold fish”, “fish out of water” or something that is “fishy” about a situation. It may also imply a slippery or elusive situation.
Witch's Well 